Check the ribbon cable connection of the LCD screen. It may be loose, try to re-plug it and see if it works.
Here’s the link - ELEGOO MARS 4 ULTRA: How to replace the LCD screen? - https://youtu.be/-SqhtVeQTGs
Check the ribbon cable connection of the LCD screen. It may be loose, try to re-plug it and see if it works.
Here’s the link - ELEGOO MARS 4 ULTRA: How to replace the LCD screen? - https://youtu.be/-SqhtVeQTGs